Electrical boiler



L. R. BRUNSWICK.

ELECTRICAL BOILER. APPLICATION FILED SEPTJZ, \920 Patented May 17, 1921.

2 SHEETS-SHEE? l.

5 14.0 e wto'c Ill/ll] I L. R. BRUNSWICK. ELECTRICAL BOILER.

APPLICATION FILED SEPT=22y I920 Patentd May 1 7, 192; 2 SHEETS-SHEET 2.

I provide a novelheating boiler for this pur- 45 i drawings, the boileris composed of inner and outer shells 10 and 11, spaced b non-' ,ourraoSTATES PATENT OFFICE.

'LEoNAnnn. isnunswrcx, orsurmuon, WISCONSIN.

ELECTRICAL BOILER;

- Specification of Letters Patent.

Application filed September 22, 1920. Serial No. 412,044.

Toall'whomit may aomem. 7

Be it known that I, LEONARD R. BRUNS- WICK, a citizen of the UnitedStates, residing at, Superior, in the county of Douglas and State ofWisconsin, have invented certain new and useful. Improvements, inElectrical Boilers, of which the following is a specification, referencebeing had to the accompanying drawings. ,7 v I s a This inventionrelates to electrical boilers. An important object of the invention is iI to provide a device of this character which may be employed inconnect-ion with the heating plants of houses.

A further object of the invention is to for the purpose of illustrationis shown a preferred embodiment of myinvention, and wherein likereference, characters designate like partsthroughout: s

. a Figure 1 isa side elevation partly in section of an electricalboiler constructed in accordance with my invention;

Fig. 2 is a transverse sectional view taken therethrough, the heatingunits and tubes being removed"; s e

Fig. '3 is a longitudinal sectional view taken through the heating tubeand unit of my boiler, partly shown in elevation for the pu se ofillustration;

1g. 4 is, a section on Fi.3

ig. 5 is asec'tion on the line 5-5 of the line 4-4 of Fig; 3, and j r 1g. v6 i a section on the line 6-6 of eferring now ,more particularly tothe conducting" spacing elements 13. t the lowerside of theboiler aninlet liextends through both inner and outer shells and communicateswith the interior of the boiler andat the upper side thereof an outlet15 extends through the 'shells' and COIIIIIIIriIE- inlet 14 and outlet15 are preferably arranged at opposite ends of the boiler. Each end ofthe boiler is closed by a continuation of the side walls 10 and 11, oneof these ends having the spaced walls 10 and 11 thereof provided withverticallyspaced transverse rows of openings extending through bothinnerand'outer walls. "At spaced intervals within the boiler are arrangedspacing plates 21, having suitable means for securing them to the innerwall of the boiler. These plates are provided with openings similarlyarrangedto the openings 20 formed in the, end wall.

Tubes 22, having their inner ends closed, extend through the aline'dopenings in the end walls and spacing plates 21, and have their outerends secured to the boiler wall as at 23 to form an airand water-tightjoint. It will be observed that the space between the inner and outershells of the boiler is sealed,-and I prefer that the air within thisspace be withdrawnto form a vacuum insulation for the interior of theboiler. I

The outer wall 10 of the boiler'extends beyond the end thereof providedwith the openings 20 for a short distance as at 16 forming a flangereceiving a 'false end 18 having a door 19 through which access may behad to the end wall proper of the boiler. Heating units 25 of lesslength than the tubes 22 are provided, each embodying a central,preferably tubular, stiffening core 26 provided adjacent the endsthereofwith transversely extending vanchorpins 27, the ends of which aredisposed externally of the outer. face of the stiffening medium.

This stifi'ening core is surrounded by a suitable heat resistantmaterial 28 such as porcelain. Atitsinnerend the porcelain is providedwith an enlargement- 29 preferably conformed to the shape of .the inner"end of the tube 22., Extendingoutwardly from the side walls of theporcelain casing are radial flanges 30 arranged at spaced interlaincasing is a bore :31having itsendopening through the face of theenlargement 29 at the inner end of the casing. Interends of the heatingunits 25 mediate the flanges 30 the casing is externally spirallygrooved as indicated at 32 for the reception of a resistance element 33preferably formed of spirally formed nichrome wire. Arranged at theouter end of the heat resisting element 25 is an insulating end plate atspaced from and secured to the flange 30 at the outer end by means ofbolts 35 or the like and having its outer face substantially flush withthe outer end of the tube. Intermediate the outer face of the flange andthe end plate 34: is disposed a layer 36 of electrical and heatinsulating material of a compressible nature such as asbestos.

Extending through the plate at and the layer 36 are terminal connections37, one of which communicates with the bore 30 formed in the end flange30 and the other of which communicates with the longitudinal bore 31 ofthe porcelain casing 28. It will, of course, be understood that aconductor is connected with the inner end of the resistance coil 33 andextends through the bore 31 for connection with one of the terminals andthat the outer end of the coil is connected with the other terminal tocomplete the circuit. Through the extended portion 16 of the outer wall10 extend insulated conductors 38 which are connected with the terminals37 in the conventional manner.

It will be understood that by reason of the construction hereinbeforedescribed in event of the destruction of any of the heating units thesame may be readily removed by opening the door 19, disconnecting thesame, and withdrawing the unit 25 as a whole from its tube 22, when itmay be reaired or replaced as it is found necessary.

y reason of the spacing of the tubes 22, the water is enabled tocirculate therebetween for heating, and, due to the fact that not onlyare the contents of the boiler heat insulated from the action ofcurrents of air passing about the boiler, but the exposed themselves,layer 36, a is encountare, likewise, insulated by the minimum amount ofheat loss ered.

It will be obvious that by reason of the facility with which the heatingunits may be handled, and the fact that the heat insulation in my deviceis not limited merely to the boiler but is extended to the heating unitsthemselves or the exposed portions thereof, my device is particularlywell adapted for use and, that, while the construction hereinbefore setforth is that construction which is preferred and which I have foundmost efflcient in use, it will be obvious that many minor changes couldbe made therein without in any manner departing from the spirit of myinvention. I accordingly do not limit .myself to this specific structurehereinbefore set forth, except as so limited by the subjoined claims.

Having described my invention, what I claim is:

1. An electrical boiler comprising inner and outer shells arranged inspaced relation, a series of spaced openings formed in one end wall ofthe boiler through said inner and outer shells, tubes within the boilerhaving their inner ends closed, said tubes extending through saidopenings, said tubes being secured to said inner and outer shells at thesides of the opening through which they extend to form a fluid-tightjoint, the space intermediate said inner and outer walls forming a heatinsulation for the interior of the boiler, electrical heating unitsdisposed within said tubes, the outer shell of said boiler projectingbeyond the end thereof provided with the tube receiving openings andbeing adapted for the reception of a false end and a door formed in saidfalse end and providing access to the exposed ends of said electricalheating units.

2. The combination with a tube having one end closed, of an electricalheating unit disposed within the tube, comprising an inner rigid coreprovided at the ends thereof with transverse pins extending beyond thewalls of the core and forming anchors, a body portion of heat resistantnonconducting material disposed about said inner core and provided atspaced intervals with outstanding portions forming flanges engaging theinner wall of said tube, a spiral groove formed in the outer surfaceof'said insulating material intermediate said flanges and an electricalresistance element disposed within said spiral groove.

3. The combination with a tube having one end closed, of an electricalheating unit disposed within the tube, comprising an inner rigid coreprovided at the ends'thereof with transverse pins extending beyond thewalls of the core and forming anchors, a body portion of heat resistantnonconducting material disposed about said inner core and provided atspaced intervals with outstanding portions forming flanges engaging theinner wall of said tube, aspiral groove formed in the outer surface ofsaid insulating material intermediate said flanges'and an electricalresistance element disposed within said spiral groove, said flangeshaving openings formed therein through which said resistance elementextends.

4. The combination with a tube having one end closed, of an electricalheating unit disposed within the tube, comprising an inner rigid coreprovided at the ends thereof with transverse pins extending beyond thewalls of the core and forming anchors, a body portion of heat resistantnonconducting material disposed about said inner core and provided atspaced intervals with outstanding portions forming flanges engaging themner wall of said tube, a spiral groove the outer en of said heatingunit and havin its outer face flush with the end of said tu e, a heatinsulating member disposed intermediate said plate and the end of saidunit and binding posts carried by said plate and connected with the endsof said resistance element.

5. An electrical boiler having the usual side and end walls and having aseries of spaced openings formed in one end wall thereof, tubes withinthe boiler having their inner ends closed, said tubes extending throughsaid openings, said tubes being secured to said end at the sides of theopening through which they extend to form a fluidti ht oint, electricalheating units disposed within said tubes, a plate secured to and spacedfrom the outer ends of each of said units, and a layer of heat andelectrical insulating material disposed intermediate said plates and theouter ends of said heating units.

6. An electrical boiler having the usual side and end walls and having aseries of spaced openings formed in one wall thereof, tubes within theboiler havin their inner ends closed, said tubes exten ing through saidopenings, said'tubes being secured to said end wall at the sides of theopening through which they extend to form a fluidtight oint, electricalheating units disposed within said tubes, a plate secured to and spacedfrom the outer ends of each of said units, and having its outer endsubstantiall' flush with the outer end of the tube in whic the heatingunit is'disposed, and a la er of compressible heat and electrical insuating material disposed intermediate said plates and the outer ends ofsaid heating units.

7. An electrical boiler having the usual side and end walls, a series ofspaced open- 1 ings formed in one end wall of the boiler,

tubes within the boiler havin their inner ends closed, said tubes extening throu h said openings and electrical heating units disposed withinsaid tubes and having their outer ends exposed, said outer ends beingheat insulated from the body portion of the heating units.

In testimony whereof I hereunto aflix my signature.

LEONARD R. BRUNSWICK.

